X-Git-Url: http://git.tuebingen.mpg.de/?p=dss.git;a=blobdiff_plain;f=dss.c;h=c2aef361287fef0d9a2aafcf787a96ae24f9d37f;hp=9f39324500ffa915af5e0c593ae7d56d40eb5062;hb=56f81b0dfa62bb5bf2c338733d9370a8b11bfc39;hpb=b76728084d7b36d55e08764c9de42ad59fd6f6fd diff --git a/dss.c b/dss.c index 9f39324..c2aef36 100644 --- a/dss.c +++ b/dss.c @@ -1,16 +1,14 @@ -/* - * Copyright (C) 2008-2011 Andre Noll - * - * Licensed under the GPL v2. For licencing details see COPYING. - */ +/* SPDX-License-Identifier: GPL-2.0 */ #include #include +#include #include #include #include #include #include #include +#include #include #include #include @@ -19,10 +17,11 @@ #include #include #include - +#include +#include +#include #include "gcc-compat.h" -#include "cmdline.h" #include "log.h" #include "str.h" #include "err.h" @@ -34,9 +33,36 @@ #include "tv.h" #include "snap.h" #include "ipc.h" +#include "dss.lsg.h" + +#define CMD_PTR(_cname) lls_cmd(LSG_DSS_CMD_ ## _cname, dss_suite) +#define OPT_RESULT(_cname, _oname) (lls_opt_result(\ + LSG_DSS_ ## _cname ## _OPT_ ## _oname, (CMD_PTR(_cname) == CMD_PTR(DSS))? lpr : sublpr)) +#define OPT_GIVEN(_cname, _oname) (lls_opt_given(OPT_RESULT(_cname, _oname))) +#define OPT_STRING_VAL(_cname, _oname) (lls_string_val(0, \ + OPT_RESULT(_cname, _oname))) +#define OPT_UINT32_VAL(_cname, _oname) (lls_uint32_val(0, \ + OPT_RESULT(_cname, _oname))) + +struct dss_user_data {int (*handler)(void);}; +#define EXPORT_CMD_HANDLER(_cmd) const struct dss_user_data \ + lsg_dss_com_ ## _cmd ## _user_data = { \ + .handler = com_ ## _cmd \ + }; -/** Command line and config file options. */ -static struct gengetopt_args_info conf; +/* + * Command line and active options. We need to keep a copy of the parsed + * command line options for the SIGHUP case where we merge the command line + * options and the new config file options. + */ +static struct lls_parse_result *cmdline_lpr, *lpr; + +/** Parsed subcommand options. */ +static struct lls_parse_result *cmdline_sublpr, *sublpr; +/* The executing subcommand (NULL at startup). */ +static const struct lls_command *subcmd; +/** Wether daemon_init() was called. */ +static bool daemonized; /** Non-NULL if we log to a file. */ static FILE *logfile; /** The read end of the signal pipe */ @@ -45,6 +71,8 @@ static int signal_pipe; static pid_t create_pid; /** Whether the pre-create-hook/rsync/post-create-hook is currently stopped. */ static int create_process_stopped; +/** How many times in a row the rsync command failed. */ +static int num_consecutive_rsync_errors; /** Process id of current pre-remove/rm/post-remove process. */ static pid_t remove_pid; /** When the next snapshot is due. */ @@ -53,7 +81,7 @@ static int64_t next_snapshot_time; static struct timeval next_removal_check; /** Creation time of the snapshot currently being created. */ static int64_t current_snapshot_creation_time; -/** The snapshot currently being removed. */ +/* Set by the pre-rm hook, cleared by handle_remove_exit(). */ struct snapshot *snapshot_currently_being_removed; /** Needed by the post-create hook. */ static char *path_to_last_complete_snapshot; @@ -71,6 +99,7 @@ static const char *hook_status_description[] = {HOOK_STATUS_ARRAY}; static int disk_space_low(struct disk_space *ds) { struct disk_space ds_struct; + uint32_t val; if (!ds) { int ret = get_disk_space(".", &ds_struct); @@ -78,14 +107,17 @@ static int disk_space_low(struct disk_space *ds) return ret; ds = &ds_struct; } - if (conf.min_free_mb_arg) - if (ds->free_mb < conf.min_free_mb_arg) + val = OPT_UINT32_VAL(DSS, MIN_FREE_MB); + if (val != 0) + if (ds->free_mb < val) return 1; - if (conf.min_free_percent_arg) - if (ds->percent_free < conf.min_free_percent_arg) + val = OPT_UINT32_VAL(DSS, MIN_FREE_PERCENT); + if (val != 0) + if (ds->percent_free < val) return 1; - if (conf.min_free_percent_inodes_arg) - if (ds->percent_free_inodes < conf.min_free_percent_inodes_arg) + val = OPT_UINT32_VAL(DSS, MIN_FREE_PERCENT_INODES); + if (val != 0) + if (ds->percent_free_inodes < val) return 1; return 0; } @@ -93,12 +125,13 @@ static int disk_space_low(struct disk_space *ds) static void dump_dss_config(const char *msg) { const char dash[] = "-----------------------------"; + char *lopsub_dump; int ret; FILE *log = logfile? logfile : stderr; struct disk_space ds; int64_t now = get_current_time(); - if (conf.loglevel_arg > INFO) + if (OPT_UINT32_VAL(DSS, LOGLEVEL) > INFO) return; fprintf(log, "%s <%s config> %s\n", dash, msg, dash); @@ -114,20 +147,27 @@ static void dump_dss_config(const char *msg) /* we continue on errors from get_disk_space */ - fprintf(log, "\n*** command line and config file options ***\n\n"); - cmdline_parser_dump(log, &conf); + fprintf(log, "\n*** non-default options ***\n\n"); + lopsub_dump = lls_dump_parse_result(lpr, CMD_PTR(DSS), true); + fprintf(log, "%s", lopsub_dump); + free(lopsub_dump); + fprintf(log, "\n*** non-default options for \"run\" ***\n\n"); + lopsub_dump = lls_dump_parse_result(lpr, CMD_PTR(RUN), true); + fprintf(log, "%s", lopsub_dump); + free(lopsub_dump); fprintf(log, "\n*** internal state ***\n\n"); fprintf(log, "pid: %d\n" - "logile: %s\n" + "logfile: %s\n" "snapshot_currently_being_removed: %s\n" "path_to_last_complete_snapshot: %s\n" "reference_snapshot: %s\n" "snapshot_creation_status: %s\n" "snapshot_removal_status: %s\n" + "num_consecutive_rsync_errors: %d\n" , (int) getpid(), - logfile? conf.logfile_arg : "stderr", + logfile? OPT_STRING_VAL(RUN, LOGFILE) : "stderr", snapshot_currently_being_removed? snapshot_currently_being_removed->name : "(none)", path_to_last_complete_snapshot? @@ -135,7 +175,8 @@ static void dump_dss_config(const char *msg) name_of_reference_snapshot? name_of_reference_snapshot : "(none)", hook_status_description[snapshot_creation_status], - hook_status_description[snapshot_removal_status] + hook_status_description[snapshot_removal_status], + num_consecutive_rsync_errors ); if (create_pid != 0) fprintf(log, @@ -166,28 +207,6 @@ static void dump_dss_config(const char *msg) fprintf(log, "%s %s\n", dash, msg, dash); } -/* a litte cpp magic helps to DRY */ -#define COMMANDS \ - COMMAND(ls) \ - COMMAND(create) \ - COMMAND(prune) \ - COMMAND(run) \ - COMMAND(kill) \ - COMMAND(reload) \ - -#define COMMAND(x) static int com_ ##x(void); -COMMANDS -#undef COMMAND -#define COMMAND(x) if (conf.x ##_given) return com_ ##x(); -static int call_command_handler(void) -{ - COMMANDS - DSS_EMERG_LOG(("BUG: did not find command handler\n")); - return -E_BUG; -} -#undef COMMAND -#undef COMMANDS - static int loglevel = -1; static const char *location_file = NULL; static int location_line = -1; @@ -216,20 +235,24 @@ __printf_1_2 void dss_log(const char* fmt,...) struct tm *tm; time_t t1; char str[255] = ""; + int lpr_ll = lpr? OPT_UINT32_VAL(DSS, LOGLEVEL) : WARNING; - if (loglevel < conf.loglevel_arg) + if (loglevel < lpr_ll) return; outfd = logfile? logfile : stderr; - time(&t1); - tm = localtime(&t1); - strftime(str, sizeof(str), "%b %d %H:%M:%S", tm); - fprintf(outfd, "%s ", str); - if (conf.loglevel_arg <= INFO) - fprintf(outfd, "%i: ", loglevel); + if (subcmd == CMD_PTR(RUN)) { + time(&t1); + tm = localtime(&t1); + strftime(str, sizeof(str), "%b %d %H:%M:%S", tm); + fprintf(outfd, "%s ", str); + if (lpr_ll <= INFO) + fprintf(outfd, "%i: ", loglevel); + } + if (subcmd == CMD_PTR(RUN)) #ifdef DSS_NO_FUNC_NAMES - fprintf(outfd, "%s:%d: ", location_file, location_line); + fprintf(outfd, "%s:%d: ", location_file, location_line); #else - fprintf(outfd, "%s: ", location_func); + fprintf(outfd, "%s: ", location_func); #endif va_start(argp, fmt); vfprintf(outfd, fmt, argp); @@ -241,7 +264,7 @@ __printf_1_2 void dss_log(const char* fmt,...) */ static __printf_1_2 void dss_msg(const char* fmt,...) { - FILE *outfd = conf.daemon_given? logfile : stdout; + FILE *outfd = logfile? logfile : stdout; va_list argp; va_start(argp, fmt); vfprintf(outfd, fmt, argp); @@ -252,54 +275,149 @@ static char *get_config_file_name(void) { char *home, *config_file; - if (conf.config_file_given) - return dss_strdup(conf.config_file_arg); + if (OPT_GIVEN(DSS, CONFIG_FILE)) + return dss_strdup(OPT_STRING_VAL(DSS, CONFIG_FILE)); home = get_homedir(); config_file = make_message("%s/.dssrc", home); free(home); return config_file; } -static int send_signal(int sig) +static int send_signal(int sig, bool wait) { pid_t pid; char *config_file = get_config_file_name(); int ret = get_dss_pid(config_file, &pid); + unsigned ms = 32; + struct timespec ts; free(config_file); if (ret < 0) return ret; - if (conf.dry_run_given) { + if (OPT_GIVEN(DSS, DRY_RUN)) { dss_msg("%d\n", (int)pid); return 0; } + DSS_NOTICE_LOG(("sending signal %d to pid %d\n", sig, (int)pid)); ret = kill(pid, sig); if (ret < 0) return -ERRNO_TO_DSS_ERROR(errno); - return 1; + if (!wait) + return 1; + while (ms < 5000) { + ts.tv_sec = ms / 1000; + ts.tv_nsec = (ms % 1000) * 1000 * 1000; + ret = nanosleep(&ts, NULL); + if (ret < 0) + return -ERRNO_TO_DSS_ERROR(errno); + ret = kill(pid, 0); + if (ret < 0) { + if (errno != ESRCH) + return -ERRNO_TO_DSS_ERROR(errno); + return 1; + } + ms *= 2; + } + return -E_KILL_TIMEOUT; } +struct signal_info { + const char * const name; + int num; +}; + +/* + * The table below was taken 2016 from proc/sig.c of procps-3.2.8. Copyright + * 1998-2003 by Albert Cahalan, GPLv2. + */ +static const struct signal_info signal_table[] = { + {"ABRT", SIGABRT}, /* IOT */ + {"ALRM", SIGALRM}, + {"BUS", SIGBUS}, + {"CHLD", SIGCHLD}, /* CLD */ + {"CONT", SIGCONT}, + {"FPE", SIGFPE}, + {"HUP", SIGHUP}, + {"ILL", SIGILL}, + {"INT", SIGINT}, + {"KILL", SIGKILL}, + {"PIPE", SIGPIPE}, +#ifdef SIGPOLL + {"POLL", SIGPOLL}, /* IO */ +#endif + {"PROF", SIGPROF}, +#ifdef SIGPWR + {"PWR", SIGPWR}, +#endif + {"QUIT", SIGQUIT}, + {"SEGV", SIGSEGV}, +#ifdef SIGSTKFLT + {"STKFLT", SIGSTKFLT}, +#endif + {"STOP", SIGSTOP}, + {"SYS", SIGSYS}, /* UNUSED */ + {"TERM", SIGTERM}, + {"TRAP", SIGTRAP}, + {"TSTP", SIGTSTP}, + {"TTIN", SIGTTIN}, + {"TTOU", SIGTTOU}, + {"URG", SIGURG}, + {"USR1", SIGUSR1}, + {"USR2", SIGUSR2}, + {"VTALRM", SIGVTALRM}, + {"WINCH", SIGWINCH}, + {"XCPU", SIGXCPU}, + {"XFSZ", SIGXFSZ} +}; + +#define SIGNAL_TABLE_SIZE (sizeof(signal_table) / sizeof(signal_table[0])) +#ifndef SIGRTMAX +#define SIGRTMAX 64 +#endif + static int com_kill(void) { - return send_signal(SIGTERM); -} + bool w_given = OPT_GIVEN(KILL, WAIT); + const char *arg = OPT_STRING_VAL(KILL, SIGNAL); + int ret, i; -static int com_reload(void) -{ - return send_signal(SIGHUP); + if (*arg >= '0' && *arg <= '9') { + int64_t val; + ret = dss_atoi64(arg, &val); + if (ret < 0) + return ret; + if (val < 0 || val > SIGRTMAX) + return -ERRNO_TO_DSS_ERROR(EINVAL); + return send_signal(val, w_given); + } + if (strncasecmp(arg, "sig", 3) == 0) + arg += 3; + if (strcasecmp(arg, "CLD") == 0) + return send_signal(SIGCHLD, w_given); + if (strcasecmp(arg, "IOT") == 0) + return send_signal(SIGABRT, w_given); + for (i = 0; i < SIGNAL_TABLE_SIZE; i++) + if (strcasecmp(arg, signal_table[i].name) == 0) + return send_signal(signal_table[i].num, w_given); + DSS_ERROR_LOG(("invalid sigspec: %s\n", arg)); + return -ERRNO_TO_DSS_ERROR(EINVAL); } +EXPORT_CMD_HANDLER(kill); static void dss_get_snapshot_list(struct snapshot_list *sl) { - get_snapshot_list(sl, conf.unit_interval_arg, conf.num_intervals_arg); + get_snapshot_list(sl, OPT_UINT32_VAL(DSS, UNIT_INTERVAL), + OPT_UINT32_VAL(DSS, NUM_INTERVALS)); } static int64_t compute_next_snapshot_time(void) { int64_t x = 0, now = get_current_time(), unit_interval - = 24 * 3600 * conf.unit_interval_arg, ret; - unsigned wanted = desired_number_of_snapshots(0, conf.num_intervals_arg), - num_complete_snapshots = 0; + = 24 * 3600 * OPT_UINT32_VAL(DSS, UNIT_INTERVAL), ret, + last_completion_time; + unsigned wanted = desired_number_of_snapshots(0, + OPT_UINT32_VAL(DSS, NUM_INTERVALS)), + num_complete = 0; int i; struct snapshot *s = NULL; struct snapshot_list sl; @@ -308,18 +426,19 @@ static int64_t compute_next_snapshot_time(void) FOR_EACH_SNAPSHOT(s, i, &sl) { if (!(s->flags & SS_COMPLETE)) continue; - num_complete_snapshots++; + num_complete++; x += s->completion_time - s->creation_time; + last_completion_time = s->completion_time; } assert(x >= 0); ret = now; - if (num_complete_snapshots == 0) + if (num_complete == 0) goto out; - x /= num_complete_snapshots; /* avg time to create one snapshot */ + x /= num_complete; /* avg time to create one snapshot */ if (unit_interval < x * wanted) /* oops, no sleep at all */ goto out; - ret = s->completion_time + unit_interval / wanted - x; + ret = last_completion_time + unit_interval / wanted - x; out: free_snapshot_list(&sl); return ret; @@ -355,8 +474,8 @@ static void pre_create_hook(void) assert(snapshot_creation_status == HS_READY); /* make sure that the next snapshot time will be recomputed */ invalidate_next_snapshot_time(); - DSS_DEBUG_LOG(("executing %s\n", conf.pre_create_hook_arg)); - dss_exec_cmdline_pid(&create_pid, conf.pre_create_hook_arg); + DSS_DEBUG_LOG(("executing %s\n", OPT_STRING_VAL(DSS, PRE_CREATE_HOOK))); + dss_exec_cmdline_pid(&create_pid, OPT_STRING_VAL(DSS, PRE_CREATE_HOOK)); snapshot_creation_status = HS_PRE_RUNNING; } @@ -375,8 +494,8 @@ static void pre_remove_hook(struct snapshot *s, const char *why) *snapshot_currently_being_removed = *s; snapshot_currently_being_removed->name = dss_strdup(s->name); - cmd = make_message("%s %s/%s", conf.pre_remove_hook_arg, - conf.dest_dir_arg, s->name); + cmd = make_message("%s %s/%s", OPT_STRING_VAL(DSS, PRE_REMOVE_HOOK), + OPT_STRING_VAL(DSS, DEST_DIR), s->name); DSS_DEBUG_LOG(("executing %s\n", cmd)); dss_exec_cmdline_pid(&remove_pid, cmd); free(cmd); @@ -419,7 +538,7 @@ static struct snapshot *find_orphaned_snapshot(struct snapshot_list *sl) struct snapshot *s; int i; - DSS_DEBUG_LOG(("looking for orphaned snapshots\n")); + DSS_DEBUG_LOG(("looking for old incomplete snapshots\n")); FOR_EACH_SNAPSHOT(s, i, sl) { if (snapshot_is_being_created(s)) continue; @@ -463,10 +582,11 @@ static struct snapshot *find_redundant_snapshot(struct snapshot_list *sl) int i, interval; struct snapshot *s; unsigned missing = 0; + uint32_t N = OPT_UINT32_VAL(DSS, NUM_INTERVALS); DSS_DEBUG_LOG(("looking for intervals containing too many snapshots\n")); - for (interval = conf.num_intervals_arg - 1; interval >= 0; interval--) { - unsigned keep = desired_number_of_snapshots(interval, conf.num_intervals_arg); + for (interval = N - 1; interval >= 0; interval--) { + unsigned keep = desired_number_of_snapshots(interval, N); unsigned num = sl->interval_count[interval]; struct snapshot *victim = NULL, *prev = NULL; int64_t score = LONG_MAX; @@ -516,13 +636,13 @@ static struct snapshot *find_outdated_snapshot(struct snapshot_list *sl) struct snapshot *s; DSS_DEBUG_LOG(("looking for snapshots belonging to intervals >= %d\n", - conf.num_intervals_arg)); + OPT_UINT32_VAL(DSS, NUM_INTERVALS))); FOR_EACH_SNAPSHOT(s, i, sl) { if (snapshot_is_being_created(s)) continue; if (is_reference_snapshot(s)) continue; - if (s->interval < conf.num_intervals_arg) + if (s->interval < OPT_UINT32_VAL(DSS, NUM_INTERVALS)) continue; return s; } @@ -535,7 +655,7 @@ static struct snapshot *find_oldest_removable_snapshot(struct snapshot_list *sl) struct snapshot *s, *ref = NULL; num_complete = num_complete_snapshots(sl); - if (num_complete <= conf.min_complete_arg) + if (num_complete <= OPT_UINT32_VAL(DSS, MIN_COMPLETE)) return NULL; FOR_EACH_SNAPSHOT(s, i, sl) { if (snapshot_is_being_created(s)) @@ -595,16 +715,26 @@ static int try_to_free_disk_space(void) if (tv_diff(&next_removal_check, &now, NULL) > 0) return 0; if (!low_disk_space) { - if (conf.keep_redundant_given) + if (OPT_GIVEN(DSS, KEEP_REDUNDANT)) return 0; if (snapshot_creation_status != HS_READY) return 0; if (next_snapshot_is_due()) return 0; } + /* + * Idle and --keep_redundant not given, or low disk space. Look at + * existing snapshots. + */ dss_get_snapshot_list(&sl); ret = 0; - if (!low_disk_space && sl.num_snapshots <= 1) + /* + * Don't remove anything if there is free space and we have fewer + * snapshots than configured, plus one. This way there is always one + * snapshot that can be recycled. + */ + if (!low_disk_space && sl.num_snapshots <= + 1 << OPT_UINT32_VAL(DSS, NUM_INTERVALS)) goto out; why = "outdated"; victim = find_outdated_snapshot(&sl); @@ -614,14 +744,15 @@ static int try_to_free_disk_space(void) victim = find_redundant_snapshot(&sl); if (victim) goto remove; - /* try harder only if disk space is low */ - if (!low_disk_space) - goto out; why = "orphaned"; victim = find_orphaned_snapshot(&sl); if (victim) goto remove; + /* try harder only if disk space is low */ + if (!low_disk_space) + goto out; DSS_WARNING_LOG(("disk space low and nothing obvious to remove\n")); + why = "oldest"; victim = find_oldest_removable_snapshot(&sl); if (victim) goto remove; @@ -637,8 +768,9 @@ out: static void post_create_hook(void) { - char *cmd = make_message("%s %s/%s", conf.post_create_hook_arg, - conf.dest_dir_arg, path_to_last_complete_snapshot); + char *cmd = make_message("%s %s/%s", + OPT_STRING_VAL(DSS, POST_CREATE_HOOK), + OPT_STRING_VAL(DSS, DEST_DIR), path_to_last_complete_snapshot); DSS_NOTICE_LOG(("executing %s\n", cmd)); dss_exec_cmdline_pid(&create_pid, cmd); free(cmd); @@ -652,8 +784,8 @@ static void post_remove_hook(void) assert(s); - cmd = make_message("%s %s/%s", conf.post_remove_hook_arg, - conf.dest_dir_arg, s->name); + cmd = make_message("%s %s/%s", OPT_STRING_VAL(DSS, POST_REMOVE_HOOK), + OPT_STRING_VAL(DSS, DEST_DIR), s->name); DSS_NOTICE_LOG(("executing %s\n", cmd)); dss_exec_cmdline_pid(&remove_pid, cmd); free(cmd); @@ -844,23 +976,28 @@ static int handle_rsync_exit(int status) es = WEXITSTATUS(status); /* * Restart rsync on non-fatal errors: - * 12: Error in rsync protocol data stream - * 13: Errors with program diagnostics + * 24: Partial transfer due to vanished source files */ - if (es == 12 || es == 13) { - DSS_WARNING_LOG(("rsync process %d returned %d -- restarting\n", - (int)create_pid, es)); + if (es != 0 && es != 24) { + DSS_WARNING_LOG(("rsync exit code %d, error count %d\n", + es, ++num_consecutive_rsync_errors)); + if (!logfile) { /* called by com_run() */ + ret = -E_BAD_EXIT_CODE; + goto out; + } + if (num_consecutive_rsync_errors > + OPT_UINT32_VAL(RUN, MAX_RSYNC_ERRORS)) { + ret = -E_TOO_MANY_RSYNC_ERRORS; + snapshot_creation_status = HS_READY; + goto out; + } + DSS_WARNING_LOG(("restarting rsync process\n")); snapshot_creation_status = HS_NEEDS_RESTART; next_snapshot_time = get_current_time() + 60; ret = 1; goto out; } - if (es != 0 && es != 23 && es != 24) { - DSS_ERROR_LOG(("rsync process %d returned %d\n", (int)create_pid, es)); - ret = -E_BAD_EXIT_CODE; - snapshot_creation_status = HS_READY; - goto out; - } + num_consecutive_rsync_errors = 0; ret = rename_incomplete_snapshot(current_snapshot_creation_time); if (ret < 0) goto out; @@ -886,7 +1023,7 @@ static int handle_pre_create_hook_exit(int status) if (es) { if (!warn_count--) { DSS_NOTICE_LOG(("pre_create_hook %s returned %d\n", - conf.pre_create_hook_arg, es)); + OPT_STRING_VAL(DSS, PRE_CREATE_HOOK), es)); DSS_NOTICE_LOG(("deferring snapshot creation...\n")); warn_count = 60; /* warn only once per hour */ } @@ -940,85 +1077,179 @@ static int handle_sigchld(void) return -E_BUG; } +/* also checks if . is a mountpoint, if --mountpoint was given */ +static int change_to_dest_dir(void) +{ + int ret; + const char *dd = OPT_STRING_VAL(DSS, DEST_DIR); + struct stat dot, dotdot; + + DSS_INFO_LOG(("changing cwd to %s\n", dd)); + if (chdir(dd) < 0) { + ret = -ERRNO_TO_DSS_ERROR(errno); + DSS_ERROR_LOG(("could not change cwd to %s\n", dd)); + return ret; + } + if (!OPT_GIVEN(DSS, MOUNTPOINT)) + return 0; + if (stat(".", &dot) < 0) { + ret = -ERRNO_TO_DSS_ERROR(errno); + DSS_ERROR_LOG(("could not stat .\n")); + return ret; + } + if (stat("..", &dotdot) < 0) { + ret = -ERRNO_TO_DSS_ERROR(errno); + DSS_ERROR_LOG(("could not stat ..\n")); + return ret; + } + if (dot.st_dev == dotdot.st_dev && dot.st_ino != dotdot.st_ino) { + DSS_ERROR_LOG(("mountpoint check failed for %s\n", dd)); + return -E_MOUNTPOINT; + } + return 1; +} + static int check_config(void) { - if (conf.unit_interval_arg <= 0) { - DSS_ERROR_LOG(("bad unit interval: %i\n", conf.unit_interval_arg)); + int ret; + uint32_t unit_interval = OPT_UINT32_VAL(DSS, UNIT_INTERVAL); + uint32_t num_intervals = OPT_UINT32_VAL(DSS, NUM_INTERVALS); + + if (unit_interval == 0) { + DSS_ERROR_LOG(("bad unit interval: %i\n", unit_interval)); return -E_INVALID_NUMBER; } - DSS_DEBUG_LOG(("unit interval: %i day(s)\n", conf.unit_interval_arg)); - if (conf.num_intervals_arg <= 0 || conf.num_intervals_arg > 30) { - DSS_ERROR_LOG(("bad number of intervals: %i\n", - conf.num_intervals_arg)); + DSS_DEBUG_LOG(("unit interval: %i day(s)\n", unit_interval)); + + if (num_intervals == 0 || num_intervals > 30) { + DSS_ERROR_LOG(("bad number of intervals: %i\n", num_intervals)); return -E_INVALID_NUMBER; } - DSS_DEBUG_LOG(("number of intervals: %i\n", conf.num_intervals_arg)); + if (subcmd == CMD_PTR(RUN) || subcmd == CMD_PTR(CREATE)) + if (!OPT_GIVEN(DSS, SOURCE_DIR)) { + DSS_ERROR_LOG(("--source-dir required\n")); + return -E_SYNTAX; + } + if (subcmd == CMD_PTR(RUN) || subcmd == CMD_PTR(CREATE) + || subcmd == CMD_PTR(LS) || subcmd == CMD_PTR(PRUNE)) { + if (!OPT_GIVEN(DSS, DEST_DIR)) { + DSS_ERROR_LOG(("--dest-dir required\n")); + return -E_SYNTAX; + } + ret = change_to_dest_dir(); + if (ret < 0) + return ret; + } + DSS_DEBUG_LOG(("number of intervals: %i\n", num_intervals)); return 1; } -/* - * Returns < 0 on errors, 0 if no config file is given and > 0 if the config - * file was read successfully. - */ -static int parse_config_file(int override) +static int lopsub_error(int lopsub_ret, char **errctx) { - int ret, config_file_exists; + const char *msg = lls_strerror(-lopsub_ret); + if (*errctx) + DSS_ERROR_LOG(("%s: %s\n", *errctx, msg)); + else + DSS_ERROR_LOG(("%s\n", msg)); + free(*errctx); + *errctx = NULL; + return -E_LOPSUB; +} + +static int parse_config_file(bool sighup, const struct lls_command *cmd) +{ + int ret, fd = -1; char *config_file = get_config_file_name(); struct stat statbuf; - char *old_logfile_arg = NULL; - int old_daemon_given = 0; - - if (override) { /* SIGHUP */ - if (conf.logfile_given) - old_logfile_arg = dss_strdup(conf.logfile_arg); - old_daemon_given = conf.daemon_given; + void *map; + size_t sz; + int cf_argc; + char **cf_argv, *errctx = NULL; + struct lls_parse_result *cf_lpr, *merged_lpr, *clpr; + const char *subcmd_name; + + ret = open(config_file, O_RDONLY); + if (ret < 0) { + if (errno != ENOENT || OPT_GIVEN(DSS, CONFIG_FILE)) { + ret = -ERRNO_TO_DSS_ERROR(errno); + DSS_ERROR_LOG(("config file %s can not be opened\n", + config_file)); + goto out; + } + /* no config file -- nothing to do */ + ret = 0; + goto success; } - - config_file_exists = !stat(config_file, &statbuf); - if (!config_file_exists && conf.config_file_given) { + fd = ret; + ret = fstat(fd, &statbuf); + if (ret < 0) { ret = -ERRNO_TO_DSS_ERROR(errno); DSS_ERROR_LOG(("failed to stat config file %s\n", config_file)); - goto out; + goto close_fd; } - if (config_file_exists) { - struct cmdline_parser_params params; - params.override = override; - params.initialize = 0; - params.check_required = 1; - params.check_ambiguity = 0; - params.print_errors = 1; - if (override) { /* invalidate all rsync options */ - int i; - - for (i = 0; i < conf.rsync_option_given; i++) { - free(conf.rsync_option_arg[i]); - conf.rsync_option_arg[i] = NULL; - } - conf.rsync_option_given = 0; - } - cmdline_parser_config_file(config_file, &conf, ¶ms); + sz = statbuf.st_size; + if (sz == 0) { /* config file is empty -- nothing to do */ + ret = 0; + goto success; } - ret = check_config(); - if (ret < 0) - goto out; - if (override) { - /* don't change daemon mode on SIGHUP */ - conf.daemon_given = old_daemon_given; - close_log(logfile); - logfile = NULL; - if (conf.logfile_given) - free(old_logfile_arg); - else if (conf.daemon_given) { /* re-use old logfile */ - conf.logfile_arg = old_logfile_arg; - conf.logfile_given = 1; - } + map = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, fd, 0); + if (map == MAP_FAILED) { + ret = -ERRNO_TO_DSS_ERROR(errno); + DSS_ERROR_LOG(("failed to mmap config file %s\n", + config_file)); + goto close_fd; + } + if (cmd == CMD_PTR(DSS)) + subcmd_name = NULL; + else + subcmd_name = lls_command_name(cmd); + ret = lls_convert_config(map, sz, subcmd_name, &cf_argv, &errctx); + munmap(map, sz); + if (ret < 0) { + DSS_ERROR_LOG(("failed to convert config file %s\n", + config_file)); + ret = lopsub_error(ret, &errctx); + goto close_fd; + } + cf_argc = ret; + ret = lls_parse(cf_argc, cf_argv, cmd, &cf_lpr, &errctx); + lls_free_argv(cf_argv); + if (ret < 0) { + ret = lopsub_error(ret, &errctx); + goto close_fd; } - if (conf.logfile_given && conf.run_given && conf.daemon_given) { - logfile = open_log(conf.logfile_arg); - log_welcome(conf.loglevel_arg); + clpr = cmd == CMD_PTR(DSS)? cmdline_lpr : cmdline_sublpr; + if (sighup) /* config file overrides command line */ + ret = lls_merge(cf_lpr, clpr, cmd, &merged_lpr, &errctx); + else /* command line options overrride config file options */ + ret = lls_merge(clpr, cf_lpr, cmd, &merged_lpr, &errctx); + lls_free_parse_result(cf_lpr, cmd); + if (ret < 0) { + ret = lopsub_error(ret, &errctx); + goto close_fd; } - DSS_DEBUG_LOG(("loglevel: %d\n", conf.loglevel_arg)); - ret = config_file_exists; + ret = 1; +success: + assert(ret >= 0); + DSS_DEBUG_LOG(("loglevel: %d\n", OPT_UINT32_VAL(DSS, LOGLEVEL))); + if (cmd != CMD_PTR(DSS)) { + if (ret > 0) { + if (sublpr != cmdline_sublpr) + lls_free_parse_result(sublpr, cmd); + sublpr = merged_lpr; + } else + sublpr = cmdline_sublpr; + } else { + if (ret > 0) { + if (lpr != cmdline_lpr) + lls_free_parse_result(lpr, cmd); + lpr = merged_lpr; + } else + lpr = cmdline_lpr; + } +close_fd: + if (fd >= 0) + close(fd); out: free(config_file); if (ret < 0) @@ -1026,24 +1257,31 @@ out: return ret; } -static int change_to_dest_dir(void) -{ - DSS_INFO_LOG(("changing cwd to %s\n", conf.dest_dir_arg)); - return dss_chdir(conf.dest_dir_arg); -} - static int handle_sighup(void) { int ret; DSS_NOTICE_LOG(("SIGHUP, re-reading config\n")); dump_dss_config("old"); - ret = parse_config_file(1); + ret = parse_config_file(true /* SIGHUP */, CMD_PTR(DSS)); if (ret < 0) return ret; + ret = parse_config_file(true /* SIGHUP */, CMD_PTR(RUN)); + if (ret < 0) + return ret; + ret = check_config(); + if (ret < 0) + return ret; + close_log(logfile); + logfile = NULL; + if (OPT_GIVEN(RUN, DAEMON) || daemonized) { + logfile = open_log(OPT_STRING_VAL(RUN, LOGFILE)); + log_welcome(OPT_UINT32_VAL(DSS, LOGLEVEL)); + daemonized = true; + } dump_dss_config("reloaded"); invalidate_next_snapshot_time(); - return change_to_dest_dir(); + return 1; } static void kill_children(void) @@ -1063,9 +1301,7 @@ static int handle_signal(void) switch (sig) { case SIGINT: case SIGTERM: - kill_children(); - ret = -E_SIGNAL; - break; + return -E_SIGNAL; case SIGHUP: ret = handle_sighup(); break; @@ -1085,11 +1321,12 @@ out: */ static int use_rsync_locally(char *logname) { - char *h = conf.remote_host_arg; + const char *h = OPT_STRING_VAL(DSS, REMOTE_HOST); if (strcmp(h, "localhost") && strcmp(h, "127.0.0.1")) return 0; - if (conf.remote_user_given && strcmp(conf.remote_user_arg, logname)) + if (OPT_GIVEN(DSS, REMOTE_USER) && + strcmp(OPT_STRING_VAL(DSS, REMOTE_USER), logname)) return 0; return 1; } @@ -1105,8 +1342,6 @@ static int rename_resume_snap(int64_t creation_time) sl.num_snapshots = 0; ret = 0; - if (conf.no_resume_given) - goto out; dss_get_snapshot_list(&sl); /* * Snapshot recycling: We first look at the newest snapshot. If this @@ -1138,11 +1373,11 @@ static int rename_resume_snap(int64_t creation_time) s = find_orphaned_snapshot(&sl); out: if (s) { - DSS_INFO_LOG(("reusing %s snapshot %s\n", why, s->name)); + DSS_NOTICE_LOG(("recycling %s snapshot %s\n", why, s->name)); ret = dss_rename(s->name, new_name); } if (ret >= 0) - DSS_NOTICE_LOG(("creating new snapshot %s\n", new_name)); + DSS_NOTICE_LOG(("creating %s\n", new_name)); free(new_name); free_snapshot_list(&sl); return ret; @@ -1151,20 +1386,30 @@ out: static void create_rsync_argv(char ***argv, int64_t *num) { char *logname; - int i = 0, j; + int i = 0, j, N = OPT_GIVEN(DSS, RSYNC_OPTION); struct snapshot_list sl; + static bool seeded; dss_get_snapshot_list(&sl); assert(!name_of_reference_snapshot); name_of_reference_snapshot = name_of_newest_complete_snapshot(&sl); free_snapshot_list(&sl); - *argv = dss_malloc((15 + conf.rsync_option_given) * sizeof(char *)); + *argv = dss_malloc((15 + N) * sizeof(char *)); (*argv)[i++] = dss_strdup("rsync"); (*argv)[i++] = dss_strdup("-a"); (*argv)[i++] = dss_strdup("--delete"); - for (j = 0; j < conf.rsync_option_given; j++) - (*argv)[i++] = dss_strdup(conf.rsync_option_arg[j]); + if (!seeded) { + srandom((unsigned)time(NULL)); /* no need to be fancy here */ + seeded = true; + } + if (1000 * (random() / (RAND_MAX + 1.0)) < OPT_UINT32_VAL(DSS, CHECKSUM)) { + DSS_NOTICE_LOG(("adding --checksum to rsync options\n")); + (*argv)[i++] = dss_strdup("--checksum"); + } + for (j = 0; j < N; j++) + (*argv)[i++] = dss_strdup(lls_string_val(j, + OPT_RESULT(DSS, RSYNC_OPTION))); if (name_of_reference_snapshot) { DSS_INFO_LOG(("using %s as reference\n", name_of_reference_snapshot)); (*argv)[i++] = make_message("--link-dest=../%s", @@ -1173,11 +1418,13 @@ static void create_rsync_argv(char ***argv, int64_t *num) DSS_INFO_LOG(("no suitable reference snapshot found\n")); logname = dss_logname(); if (use_rsync_locally(logname)) - (*argv)[i++] = dss_strdup(conf.source_dir_arg); + (*argv)[i++] = dss_strdup(OPT_STRING_VAL(DSS, SOURCE_DIR)); else - (*argv)[i++] = make_message("%s@%s:%s/", conf.remote_user_given? - conf.remote_user_arg : logname, - conf.remote_host_arg, conf.source_dir_arg); + (*argv)[i++] = make_message("%s@%s:%s/", + OPT_GIVEN(DSS, REMOTE_USER)? + OPT_STRING_VAL(DSS, REMOTE_USER) : logname, + OPT_STRING_VAL(DSS, REMOTE_HOST), + OPT_STRING_VAL(DSS, SOURCE_DIR)); free(logname); *num = get_current_time(); (*argv)[i++] = incomplete_name(*num); @@ -1201,6 +1448,7 @@ static int create_snapshot(char **argv) { int ret; + assert(argv); ret = rename_resume_snap(current_snapshot_creation_time); if (ret < 0) return ret; @@ -1294,15 +1542,18 @@ out: static void exit_hook(int exit_code) { - char *argv[3]; pid_t pid; - - argv[0] = conf.exit_hook_arg; - argv[1] = dss_strerror(-exit_code); - argv[2] = NULL; - - DSS_NOTICE_LOG(("executing %s %s\n", argv[0], argv[1])); - dss_exec(&pid, conf.exit_hook_arg, argv); + char **argv, *tmp = dss_strdup(OPT_STRING_VAL(DSS, EXIT_HOOK)); + unsigned n = split_args(tmp, &argv, " \t"); + + n++; + argv = dss_realloc(argv, (n + 1) * sizeof(char *)); + argv[n - 1] = dss_strdup(dss_strerror(-exit_code)); + argv[n] = NULL; + dss_exec(&pid, argv[0], argv); + free(argv[n - 1]); + free(argv); + free(tmp); } static void lock_dss_or_die(void) @@ -1319,23 +1570,51 @@ static void lock_dss_or_die(void) static int com_run(void) { - int ret; + int ret, fd = -1; + char *config_file; + pid_t pid; - lock_dss_or_die(); - if (conf.dry_run_given) { - DSS_ERROR_LOG(("dry_run not supported by this command\n")); + if (OPT_GIVEN(DSS, DRY_RUN)) { + DSS_ERROR_LOG(("dry run not supported by this command\n")); return -E_SYNTAX; } + config_file = get_config_file_name(); + ret = get_dss_pid(config_file, &pid); + free(config_file); + if (ret >= 0) { + DSS_ERROR_LOG(("pid %d\n", (int)pid)); + return -E_ALREADY_RUNNING; + } + if (OPT_GIVEN(RUN, DAEMON)) { + fd = daemon_init(); + daemonized = true; + logfile = open_log(OPT_STRING_VAL(RUN, LOGFILE)); + } + lock_dss_or_die(); + dump_dss_config("startup"); ret = install_sighandler(SIGHUP); if (ret < 0) return ret; + if (fd >= 0) { + ret = write(fd, "\0", 1); + if (ret != 1) { + DSS_ERROR_LOG(("write to daemon pipe returned %d\n", + ret)); + if (ret < 0) + return -ERRNO_TO_DSS_ERROR(errno); + return -E_BUG; + } + } ret = select_loop(); if (ret >= 0) /* impossible */ ret = -E_BUG; kill_children(); exit_hook(ret); + while (wait(NULL) >= 0 || errno != ECHILD) + ; /* still have children to wait for */ return ret; } +EXPORT_CMD_HANDLER(run); static int com_prune(void) { @@ -1362,7 +1641,7 @@ static int com_prune(void) ret = 0; goto out; rm: - if (conf.dry_run_given) { + if (OPT_GIVEN(DSS, DRY_RUN)) { dss_msg("%s snapshot %s (interval = %i)\n", why, victim->name, victim->interval); ret = 0; @@ -1395,6 +1674,7 @@ out: free_snapshot_list(&sl); return ret; } +EXPORT_CMD_HANDLER(prune); static int com_create(void) { @@ -1402,7 +1682,7 @@ static int com_create(void) char **rsync_argv; lock_dss_or_die(); - if (conf.dry_run_given) { + if (OPT_GIVEN(DSS, DRY_RUN)) { int i; char *msg = NULL; create_rsync_argv(&rsync_argv, ¤t_snapshot_creation_time); @@ -1443,23 +1723,36 @@ out: free_rsync_argv(rsync_argv); return ret; } +EXPORT_CMD_HANDLER(create); static int com_ls(void) { int i; struct snapshot_list sl; struct snapshot *s; + int64_t now = get_current_time(); dss_get_snapshot_list(&sl); FOR_EACH_SNAPSHOT(s, i, &sl) { - int64_t d = 0; + int64_t d; if (s->flags & SS_COMPLETE) d = (s->completion_time - s->creation_time) / 60; - dss_msg("%u\t%s\t%3" PRId64 ":%02" PRId64 "\n", s->interval, s->name, d/60, d%60); + else + d = (now - s->creation_time) / 60; + dss_msg("%u\t%s\t%3" PRId64 ":%02" PRId64 "\n", s->interval, + s->name, d / 60, d % 60); } free_snapshot_list(&sl); return 1; } +EXPORT_CMD_HANDLER(ls); + +static int com_configtest(void) +{ + printf("Syntax Ok\n"); + return 0; +} +EXPORT_CMD_HANDLER(configtest); static int setup_signal_handling(void) { @@ -1476,52 +1769,94 @@ static int setup_signal_handling(void) return install_sighandler(SIGCHLD); } -/** - * The main function of dss. - * - * \param argc Usual argument count. - * \param argv Usual argument vector. - */ +static void handle_version_and_help(void) +{ + char *txt; + + if (OPT_GIVEN(DSS, DETAILED_HELP)) + txt = lls_long_help(CMD_PTR(DSS)); + else if (OPT_GIVEN(DSS, HELP)) + txt = lls_short_help(CMD_PTR(DSS)); + else if (OPT_GIVEN(DSS, VERSION)) + txt = make_message("%s\n", VERSION_STRING); + else + return; + printf("%s", txt); + free(txt); + exit(EXIT_SUCCESS); +} + +static void show_subcommand_summary(void) +{ + const struct lls_command *cmd; + int i; + + printf("Available subcommands:\n"); + for (i = 1; (cmd = lls_cmd(i, dss_suite)); i++) { + const char *name = lls_command_name(cmd); + const char *purpose = lls_purpose(cmd); + printf("%-11s%s\n", name, purpose); + } + exit(EXIT_SUCCESS); +} + int main(int argc, char **argv) { int ret; - struct cmdline_parser_params params; + char *errctx = NULL; + unsigned num_inputs; + const struct dss_user_data *ud; - params.override = 0; - params.initialize = 1; - params.check_required = 0; - params.check_ambiguity = 0; - params.print_errors = 1; - - cmdline_parser_ext(argc, argv, &conf, ¶ms); /* aborts on errors */ - ret = parse_config_file(0); + ret = lls_parse(argc, argv, CMD_PTR(DSS), &cmdline_lpr, &errctx); + if (ret < 0) { + ret = lopsub_error(ret, &errctx); + goto out; + } + lpr = cmdline_lpr; + ret = parse_config_file(false /* no SIGHUP */, CMD_PTR(DSS)); if (ret < 0) goto out; - if (ret == 0) { /* no config file given */ - /* - * Parse the command line options again, but this time check - * that all required options are given. - */ - struct cmdline_parser_params params; - params.override = 1; - params.initialize = 1; - params.check_required = 1; - params.check_ambiguity = 1; - params.print_errors = 1; - cmdline_parser_ext(argc, argv, &conf, ¶ms); /* aborts on errors */ + handle_version_and_help(); + num_inputs = lls_num_inputs(lpr); + if (num_inputs == 0) + show_subcommand_summary(); + ret = lls_lookup_subcmd(argv[argc - num_inputs], dss_suite, &errctx); + if (ret < 0) { + ret = lopsub_error(ret, &errctx); + goto out; } - if (conf.daemon_given) - daemon_init(); - ret = change_to_dest_dir(); + subcmd = lls_cmd(ret, dss_suite); + ret = lls_parse(num_inputs, argv + argc - num_inputs, subcmd, + &cmdline_sublpr, &errctx); + if (ret < 0) { + ret = lopsub_error(ret, &errctx); + goto out; + } + sublpr = cmdline_sublpr; + ret = parse_config_file(false /* no SIGHUP */, subcmd); + if (ret < 0) + goto out; + ret = check_config(); if (ret < 0) goto out; - dump_dss_config("startup"); ret = setup_signal_handling(); if (ret < 0) goto out; - ret = call_command_handler(); + ud = lls_user_data(subcmd); + ret = ud->handler(); + signal_shutdown(); out: - if (ret < 0) + if (ret < 0) { + if (errctx) + DSS_ERROR_LOG(("%s\n", errctx)); DSS_EMERG_LOG(("%s\n", dss_strerror(-ret))); + } + free(errctx); + lls_free_parse_result(lpr, CMD_PTR(DSS)); + if (lpr != cmdline_lpr) + lls_free_parse_result(cmdline_lpr, CMD_PTR(DSS)); + lls_free_parse_result(sublpr, subcmd); + if (sublpr != cmdline_sublpr) + lls_free_parse_result(cmdline_sublpr, subcmd); exit(ret >= 0? EXIT_SUCCESS : EXIT_FAILURE); }